Unilateral Aplasia versus Bilateral Aplasia of the Vertebral Artery: A Review of Associated Abnormalities

Table 3

Distribution of 108 cases of the vertebral artery (VA) aplasia according to age.

Age of patients	Number of cases of VA aplasia
	Bilaterally	Left side	Right side	( = 108)
Stillborn		1		1
Newborn (few hours after birth)		1		1
Neonate (≤28 days)	1	1		2
Suckling (≤12 months)	1	5		6
Tot (≤3 years)		3		3
Preschool age; (≤5 years)			1	1
School age (6–12)	1			1
Adolescent (13–18)		1		1
19–30	1	2	1	4
31–40	2	3	8	13
41–50	4	4	4	12
51–60	6	9	3	18
61–70	11	7	5	23
71–80	3	5	6	14
>81		2		2
Unknown age	1	2	3	6